CN101325429B - Method for distributing district code word for mobile communication system - Google Patents
Method for distributing district code word for mobile communication system Download PDFInfo
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- CN101325429B CN101325429B CN2007101067634A CN200710106763A CN101325429B CN 101325429 B CN101325429 B CN 101325429B CN 2007101067634 A CN2007101067634 A CN 2007101067634A CN 200710106763 A CN200710106763 A CN 200710106763A CN 101325429 B CN101325429 B CN 101325429B
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Abstract
The invention discloses a district code word distribution method used in the mobile communication system, comprising: S202, obtaining the crosscorrelation between any two disturbed codes of the mobile communication system, determining the sequence of each district distribution code word of the mobile communication system; S204, according to the crosscorrelation between any two disturbed codes of the mobile communication system, distributing the disturbed codes for the district with the disturbed code word according to the sequence determined in the step S202; and S206, according to the relation between the disturbed codes for the district with the disturbed code word and the upstream pilot frequency code, the downstream pilot frequency code and the Midamble code, distributing the corresponding upstream pilot frequency code, the downstream pilot frequency code and the Midamble code for the district with the disturbed code word. According to the invention, the disturb between each district is effectively reduced, the system performance is advanced, and the system capacitance of the system is increased.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of district code word distribution method that is used for mobile communication system.
Background technology
In TD SDMA (TD-SCDMA) mobile communication system, there is different code character configurations different sub-districts, the cell code configuration set is meant the configuration of (the sub-district code character comprises ascending pilot frequency sign indicating number, downlink frequency pilot code, basic Midamble sign indicating number and scrambler in the TD-SCDMA system) of the peculiar code character in sub-district, and different adjacent cells will dispose different code characters.Because the data that receiving terminal receives are except the code character data that contain this sub-district, the code character data that also have other sub-districts, so can introduce adjacent area interference, interference between different code words varies in size, therefore be necessary to study the phase mutual interference between code word, to obtain a kind of more excellent code character allocation plan,, system group network minizone code word reduces to minimum thereby being disturbed.
Summary of the invention
One or more problems in view of the above the invention discloses a kind of district code word distribution method that is used for mobile communication system.
According to the district code word distribution method that is used for mobile communication system of the present invention, may further comprise the steps: S202, obtain the cross correlation between any two scramblers of mobile communication system, be defined as the order of each cell allocation code word of mobile communication system; S204 according to the cross correlation between any two scramblers of mobile communication system, is the cell allocation scrambler of code word to be allocated according to the order of determining among the step S202; And S206, according to being the scrambler of cell allocation of code word to be allocated and the corresponding relation between ascending pilot frequency sign indicating number, downlink frequency pilot code and the Midamble sign indicating number, be the corresponding ascending pilot frequency sign indicating number of the cell allocation of code word to be allocated, downlink frequency pilot code and Midamble sign indicating number.
In step S202, according at least a order that is defined as each cell allocation code word of mobile communication system in the following standard: the importance of the importance in geographical position, sub-district, sub-district service range, the importance of sub-district closeness, wherein, be preferably the high cell allocation code word of importance.
In step S204, be defined as the scrambler of the cell allocation of code word to be allocated according to following standard: neighbor cell is to the constraint of the multiplex distance of the constraint of the multiplex distance of the restriction of correlation size, scrambler, scrambler group, the correlation evaluation index of entire system network.
In step S202, cross correlation evaluation of estimate matrix is obtained the cross correlation between any two scramblers of mobile communication system by scrambler.
The district code word distribution method that is used for mobile communication system according to the present invention goes for CDMA mobile communication systems, synchonism CDMA mobile communication system, TDD CDMA mobile communication system and TDS-CDMA mobile communication system.Wherein, in TDS-CDMA mobile communication system, scrambler is 128 * 128 to the dimension of cross correlation evaluation of estimate matrix.
At the code distribution method that is used for mobile communication system according to the present invention, the sign indicating number resource is distributed rationally.Because the present invention is stored as matrix with correlation values between code word, so the dimension of the scrambler cross-correlation table of storage is little, it is little to take memory space, the networking scrambling code distribution method can directly be looked into this and show in the system, and not needing repeatedly to calculate in real time the correlation result, implementation complexity is little, easy to use; On the other hand, the present invention has utilized the different their cross correlations between code word to carry out the sign indicating number resource allocation, thereby has reduced the interference of minizone effectively, has improved systematic function, has increased power system capacity.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the scrambler correlation storage matrix schematic diagram according to the embodiment of the invention;
Fig. 2 is the flow chart according to the district code word distribution method that is used for mobile communication system of the embodiment of the invention.
Embodiment
In the district code word distribution method that is used for mobile communication system according to the present invention, at first analyzed the correlated results of all yards of mobile communication system to the code word of the compound scrambler of all spread spectrums, provide the right cross-correlation evaluation of estimate of all yards, then according to the size of scrambler to a correlation, give the cell allocation scrambler in the network, descending synchronous code DwPTS, UpPTS and the Midamble sign indicating number of the code character correspondence at cell scrambling place are distributed to each sub-district, thereby realized configuration code character resource in sub-district in the network.
For example, defined 128 scramblers (each scrambler length is 16) altogether in the TD-SCDMA system, be divided into 32 groups, 4 every group, group number is from 0～127.In the TD-SCDMA system, 32 descending synchronous codes (SYNC-DL sign indicating number), 256 uplink synchronous codes (SYNC-UL sign indicating number), 128 Midamble sign indicating numbers and 128 scramblers have been defined altogether.All these sign indicating numbers are divided into 32 code characters, and each code character is made up of 1 SYNC-DL sign indicating number, 8 SYNC-UL sign indicating numbers, 4 Midamble sign indicating numbers and 4 scramblers.With the scrambler is example, and 128 scramblers are divided into 32 groups, and 4 every group, group number is from 0～127, and the SYNC_DL sequence that the scrambler code character is used by the base station is determined.Preceding 4 scramblers are first group, and the 5th to the 8th scrambler is second group, and the rest may be inferred.
With reference to figure 1 and Fig. 2, the district code word distribution method that is used for mobile communication system according to the embodiment of the invention is described.As shown in Figure 2, this district code word distribution method may further comprise the steps:
S202 generates scrambler to cross correlation evaluation of estimate matrix R (as shown in Figure 1), and the dimension of this matrix is 128 * 128, element R
I, jBe that the expression scrambler is to (i, j) numerical value of the cross correlation size between.The code channel that different spreading factors can be arranged according to different business in the sub-district, interference between the different code channels of different districts is relevant with the compound scrambler of product spread spectrum of scrambler and spreading code, the decision systems performance is the correlation of compound spread spectrum scrambler rather than the correlation between simple scrambler in the networking, therefore with a numerical value estimate scrambler to their cross correlation.This evaluation scrambler is the right cross-correlation evaluation of estimate of scrambler that obtains according to certain interpretational criteria to the value of cross correlation, the characteristic of all spread spectrum compound keys that scrambler is right can both be come out by a numerical representation method, embodied scrambler to because the correlation difference that the compound scrambler characteristic of spread spectrum difference is brought.Determine the order Q of cell allocation in the network, comprise among the Q all code words to be allocated the sub-district Q1, Q2 ..., QN}, wherein, N is the sub-district number of code word to be allocated.According to certain priority principle, the code assignment ordering is carried out in sub-districts all in the network, generate the sub-district formation of a code word to be allocated, the sub-district that priority is high comes the formation front, and the sub-district that priority is low comes the formation back.This priority can be the importance in geographical position, sub-district, also can be the importance of sub-district service range, can also be the importance of sub-district closeness or the importance of certain special attribute (can formulate according to the constraints of planning).The scrambler that comes cell allocation forward more in the formation more early, the interference more little and adjacent sub-district of the correlation between the scrambler of distribution and the scrambler of adjacent sub-district is more little.
S204, according to the scrambler of calculated in advance to different cross correlation value R, according to the scrambler distribution principle in the network, be followed successively by cell allocation scrambler in the formation of sub-district to be allocated, all sub-districts in formation to be allocated all have been assigned to scrambler.This distribution principle comprises constraint and the entire system network correlation evaluation of estimate index of adjacent cell scrambling to the multiplex distance of the constraint of the multiplex distance of the restriction of correlation size, scrambler, scrambler group.
S206 according to the corresponding relation of scrambler group and downlink frequency pilot code, ascending pilot frequency code character, Midamble sign indicating number, determines to distribute to downlink frequency pilot code, ascending pilot frequency code character and the Midamble sign indicating number of each sub-district respectively.
Wherein, generating scrambler is separate to the order of cell allocation in cross correlation evaluation of estimate matrix and the definite network, which before can, the code assignment result who draws at last is the same.
In sum, in the present invention, the sign indicating number resource is distributed rationally.Because the present invention is stored as matrix with correlation values between code word, so the dimension of the scrambler cross-correlation table of storage is little, it is little to take memory space, the networking scrambling code distribution method can directly be looked into this and show in the system, and not needing repeatedly to calculate in real time the correlation result, implementation complexity is little, easy to use; On the other hand, the present invention has utilized the different their cross correlations between code word to carry out the sign indicating number resource allocation, thereby has reduced the interference of minizone effectively, has improved systematic function, has increased power system capacity.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (8)
1. a district code word distribution method that is used for mobile communication system is characterized in that, may further comprise the steps:
S202, obtain the cross correlation between any two scramblers of mobile communication system, be defined as the order of each cell allocation code word of described mobile communication system, in described S202, according at least a order that is defined as each cell allocation code word of described mobile communication system in the following standard: the importance of the importance in geographical position, sub-district, sub-district service range, the importance of sub-district closeness, wherein, be preferably the high cell allocation code word of importance;
S204 according to the cross correlation between any two scramblers of described mobile communication system, is the cell allocation scrambler of code word to be allocated according to the order of determining among the step S202; And
S206, according to being the scrambler of cell allocation of described code word to be allocated and the corresponding relation between ascending pilot frequency sign indicating number, downlink frequency pilot code and the Midamble sign indicating number, be the corresponding ascending pilot frequency sign indicating number of the cell allocation of described code word to be allocated, downlink frequency pilot code and Midamble sign indicating number.
2. district code word distribution method according to claim 1, it is characterized in that, in described step S204, be defined as the scrambler of the cell allocation of described code word to be allocated according to following standard: neighbor cell is to the constraint of the multiplex distance of the constraint of the multiplex distance of the restriction of correlation size, scrambler, scrambler group, the correlation evaluation index of entire system network.
3. district code word distribution method according to claim 1 and 2 is characterized in that, in described step S202, cross correlation evaluation of estimate matrix is obtained the cross correlation between any two scramblers of described mobile communication system by scrambler.
4. district code word distribution method according to claim 3 is characterized in that described method is applicable to CDMA mobile communication systems.
5. district code word distribution method according to claim 4 is characterized in that described method is applicable to synchonism CDMA mobile communication system.
6. district code word distribution method according to claim 4 is characterized in that described method is applicable to TDD CDMA mobile communication system.
7. district code word distribution method according to claim 4 is characterized in that described method is applicable to TDS-CDMA mobile communication system.
8. district code word distribution method according to claim 7 is characterized in that, described scrambler is 128 * 128 to the dimension of cross correlation evaluation of estimate matrix.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101067634A CN101325429B (en) | 2007-06-15 | 2007-06-15 | Method for distributing district code word for mobile communication system |
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| CN2007101067634A CN101325429B (en) | 2007-06-15 | 2007-06-15 | Method for distributing district code word for mobile communication system |
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| CN101325429A CN101325429A (en) | 2008-12-17 |
| CN101325429B true CN101325429B (en) | 2011-10-26 |
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| CN101596589B (en) * | 2009-06-30 | 2011-11-23 | 河南省西保冶材集团有限公司 | Production method of steel shot aluminum |
| CN102083075B (en) * | 2009-11-30 | 2014-02-26 | 中国移动通信集团江苏有限公司 | Frequency planning and scrambling code planning method and device based on adjacent zone priority level |
| CN103152119B (en) * | 2011-12-06 | 2015-11-04 | 中国移动通信集团北京有限公司 | System scrambler defining method, device and base station, distribution method, equipment and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1707973A (en) * | 2004-06-10 | 2005-12-14 | 大唐移动通信设备有限公司 | TD-SCDMA system cell code word planning method and method for searching composite code word combination thereof |
| CN1728622A (en) * | 2004-07-27 | 2006-02-01 | 大唐移动通信设备有限公司 | Method for planning code word in sector of TD-SCDMA system |
| WO2006058562A1 (en) * | 2004-12-01 | 2006-06-08 | Telecom Italia S.P.A. | Method for assigning scrambling codes in a cdma cellular mobile communications network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1707973A (en) * | 2004-06-10 | 2005-12-14 | 大唐移动通信设备有限公司 | TD-SCDMA system cell code word planning method and method for searching composite code word combination thereof |
| CN1728622A (en) * | 2004-07-27 | 2006-02-01 | 大唐移动通信设备有限公司 | Method for planning code word in sector of TD-SCDMA system |
| WO2006058562A1 (en) * | 2004-12-01 | 2006-06-08 | Telecom Italia S.P.A. | Method for assigning scrambling codes in a cdma cellular mobile communications network |
Non-Patent Citations (1)
| Title |
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| 杨振，杨大成.TD-SCDMA系统中的扰码规划.《中国科技论文在线》.2007,6-10. * |
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